Semiconductor device including nonvolatile memory device and logic device and manufacturing method of semiconductor device including nonvolatile memory device and logic device

ABSTRACT

A semiconductor device include a nonvolatile memory device, including a first well region formed in a substrate, a tunneling gate insulator formed on the first well region, a floating gate formed on the tunneling gate insulator, a control gate insulator formed on the substrate, a control gate formed on the control gate insulator, and a first source region and a first drain region formed on opposite sides of the control gate, respectively, and a first logic device, including a first logic well region formed in the substrate, a first logic gate insulator formed on the first logic well region, a first logic gate formed on the first logic gate insulator, wherein the first logic gate comprises substantially a same material as a material of the control gate of the nonvolatile memory device.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit under 35 USC 119(a) of Korean PatentApplication No. 10-2019-0090626 filed on Jul. 26, 2019 in the KoreanIntellectual Property Office, the entire disclosure of which isincorporated herein by reference for all purposes.

BACKGROUND 1. Field

The present following description relates to a semiconductor deviceincluding a nonvolatile memory device (NVM) and logic device. Thefollowing description also relates to a manufacturing method of asemiconductor device including a nonvolatile memory device (NVM) andlogic device.

2. Description of Related Art

System on Chip (SOC) techniques have many functional blocks that areintegrated in a single chip. Using such techniques, the memory cellarray may include a nonvolatile memory (NVM) device, such as, erasableprogrammable read-only memory (EPROM), electrically erasableprogrammable read-only memory (EEPROM), one time programmable (OTP)memory, multiple time programmable (MTP) memory, eFuse, and flashmemory. Such an EEPROM may be used to store and/or program instructionsthat may not be electrically erased when power is removed in electronicdevices, that is, are persistent. Also, an analog block may includeintegrated bipolar, complementary metal-oxide-semiconductor (CMOS) anddouble-diffused MOSFET (DMOS) (BCD), or Bipolar-CMOS-DEMOS devices. Insuch a technology, the CMOS devices may include logic devices such aslow/high voltage NMOS or PMOS devices, control logic, selectors, senseamplifiers, RAM, decoders and DC-DC converters, and may also include aplurality of CMOS transistors. Integration of a BCD device and an NVMdevice in the single chip may present certain difficulties.

SUMMARY

This Summary is provided to introduce a selection of concepts in asimplified form that are further described below in the DetailedDescription. This Summary is not intended to identify key features oressential features of the claimed subject matter, nor is it intended tobe used as an aid in determining the scope of the claimed subjectmatter.

In one general aspect, a semiconductor device includes a nonvolatilememory device, including a first well region formed in a substrate, atunneling gate insulator formed on the first well region, a floatinggate formed on the tunneling gate insulator, a control gate insulatorformed on the substrate, a control gate formed on the control gateinsulator, and a first source region and a first drain region formed onopposite sides of the control gate, respectively, and a first logicdevice, including a first logic well region formed in the substrate, afirst logic gate insulator formed on the first logic well region, afirst logic gate formed on the first logic gate insulator, wherein thefirst logic gate comprises substantially a same material as a materialof the control gate of the nonvolatile memory device, and a first logicsource region and a first logic drain region formed on opposite sides ofthe first logic gate, respectively, wherein the first logic well regionhas a depth shallower with respect to the first logic gate than a depthof the first logic well region with respect to the first logic sourceregion and the first logic drain region.

The semiconductor device may further include a second logic device,including a second logic well region formed in the substrate, a secondlogic gate insulator formed on the second logic well region, a secondlogic gate formed on the second logic gate insulator, wherein the secondlogic gate may include substantially a same material as the material ofthe control gate of the nonvolatile memory device, and a second logicsource region and a second logic drain region formed on opposite sidesof the second logic gate, respectively, wherein the second logic wellregion may have a depth shallower with respect to the second logic gatethan a depth of the second logic well region with respect to the secondlogic source region and the second logic drain region.

The control gate insulator may have a thickness greater than a thicknessof the first logic insulator and greater than a thickness of the secondlogic gate insulator.

The nonvolatile memory device may further include a hard mask patternformed on the floating gate, a thick dielectric pattern formed betweenthe floating gate and the control gate, control gate spacers formed onsidewalls of the control gate, and a first silicide layer formed on thecontrol gate.

The nonvolatile memory device may further include a deep well regionformed below the first well region, wherein the deep well region mayhave a depth greater than a depth of the first logic well region, and alightly-doped drain (LDD) region formed in the first well region,wherein the LDD region may have a depth greater than a depth of thefirst source region and greater than a depth of the first drain region.

The control gate may have a height greater than a height of the firstlogic gate with respect to a top surface of the substrate.

In another general aspect, a manufacturing method of a semiconductordevice includes forming a nonvolatile memory device, including forming afirst well region in a substrate, forming a tunneling gate insulator onthe first well region, forming a floating gate on the tunneling gateinsulator, forming a thick dielectric pattern formed on sidewalls of thefloating gate, forming a control gate insulator on the substrate,forming a control gate on the control gate insulator, and forming afirst source region and a first drain region on opposite sides of thecontrol gate, respectively, and forming a first logic device, includingforming a first logic gate insulator on the substrate, forming a firstlogic gate on the first logic gate insulator, wherein the first logicgate and the control gate are formed in the same operation, forming afirst logic well region by performing a first ion implantation ofdopants passing through the first logic gate into the substrate, formingfirst logic gate spacers formed on sidewalls of the first logic gate,and forming a first logic source region and a first logic drain regionon opposite sides of the first logic gate, respectively, wherein thefirst logic well region has a depth shallower below the first logic gatethan a depth of the first logic well region with respect to the firstlogic source region and the first logic drain region.

The forming a nonvolatile memory device may further include formingcontrol gate spacers on sidewalls of the control gate, and forming afirst silicide layer on the control gate.

The forming a nonvolatile memory device may further include forming adeep well region in the substrate, wherein the deep well region may havea depth greater than a depth of the first well region and greater than adepth of the first logic well region, and forming a lightly-doped drain(LDD) region in the first well region, wherein the LDD region may have adepth greater than a depth of the first source region and greater than adepth of the first drain region.

The forming of a floating gate on the tunneling gate insulator mayinclude forming a first conductive film on the tunneling gate insulator,forming a first hard mask pattern on the first conductive film, andperforming an etching of the first conductive film using the first hardmask pattern as a mask, thereby forming the floating gate on thetunneling gate insulator, wherein the first hard mask pattern may remainon a top surface of the floating gate.

The forming a control gate on the control gate insulator may includedepositing a second conductive film on the control gate insulator andthe floating gate, and patterning the second conductive film using anetch-back process, thereby forming the control gate on the control gateinsulator and on sidewalls of the thick dielectric pattern, wherein nocontrol gate may be formed on a top surface of the floating gate.

The forming a control gate on the control gate insulator may furtherinclude depositing a stacked layer on the second conductive film,patterning the stacked layer, thereby forming a stacked layer pattern onsidewalls of the second conductive film, removing the stacked layerpattern by wet etching using chemical etchants, and implanting dopantsinto the second conductive film.

The forming the first logic gate on the first logic gate insulator mayinclude forming the logic gate insulator on the substrate, forming asecond conductive film on the logic gate insulator, forming a secondhard mask pattern on the second conductive film, and patterning thesecond conductive film, using the second hard mask pattern, to form thefirst logic gate on the first logic gate insulator.

The control gate may be formed to enclose the floating gate.

In another general aspect, a manufacturing method of a semiconductordevice includes preparing a substrate including a cell region and alogic region, wherein a nonvolatile memory device is formed on the cellregion and a logic device is formed on the logic region, forming a firstwell region in the cell region of the substrate, forming a tunnelinggate insulator on the first well region, forming a first conductive filmon the tunneling gate insulator, patterning the first conductive film,thereby forming a floating gate on the tunneling gate insulator, forminga thick dielectric pattern on sidewalls of the floating gate, forming acontrol gate insulator on the cell region, forming a first logic gateinsulator on the logic region, forming a second conductive film on thelogic gate insulator and the control gate insulator, patterning thesecond conductive film, thereby forming a control gate on the controlgate insulator and forming a first logic gate on the first logic gateinsulator, such that the first logic gate and the control gate areformed in the same operation, forming a first logic well region byperforming a first ion implantation of dopants that pass through thefirst logic gate into the substrate, forming control gate spacers formedon each sidewall of the control gate and first logic gate spacers oneach sidewall of the first logic gate, forming a first source region anda first drain region on opposite sides of the control gate,respectively, and forming a first logic source region and a first logicdrain region on opposite sides of the first logic gate, respectively,wherein the first logic well region has a depth shallower below thefirst logic gate than a depth of the first logic well region withrespect to the first logic source region and the first logic drainregion.

The patterning the first conductive film may include forming a firsthard mask pattern on the first conductive film, and performing anetching of the first conductive film using the first hard mask patternas a mask, thereby forming the floating gate on the tunneling gateinsulator, wherein the first hard mask pattern remains on a top surfaceof the floating gate.

The patterning the second conductive film may include forming a secondhard mask pattern on the second conductive film on the logic region,wherein no second hard mask pattern is formed on the second conductivefilm on the cell region, and performing an etching process on the secondconductive film using the second hard mask pattern as a mask, such thatthe first logic gate and the control gate may be simultaneously formedon the logic region and the cell region, respectively.

The method may further include forming a deep well region formed in thesubstrate, wherein the deep well region may enclose the first wellregion, and forming an LDD region formed in the first well region,wherein the LDD region may enclose the first source region and the firstdrain region.

The method may further include forming a second logic well region byperforming a second ion implantation of dopants passing through thesecond logic gate into the substrate, forming a second logic sourceregion and a second logic drain region on opposite sides of the secondlogic gate, respectively, and wherein the second logic well region mayhave a depth shallower below the second logic gate than a depth of thesecond logic well region with respect to the second logic source regionand the second logic drain region.

In another general aspect, a semiconductor device includes a substratehaving a cell region and a logic region, wherein a nonvolatile memorydevice is formed on the cell region and a logic device is formed on thelogic region, a first well region formed in the cell region of thesubstrate, a tunneling gate insulator formed on the first well region, afirst conductive film formed on the tunneling gate insulator, a floatinggate formed on the tunneling gate insulator, a thick dielectric patternformed on sidewalls of the floating gate, a control gate insulatorformed on the cell region, a first logic gate insulator formed on thelogic region, a second conductive film formed on the logic gateinsulator and the control gate insulator, a control gate formed on thecontrol gate insulator, a first logic gate formed on the first logicgate insulator, a first logic well region formed by performing a firstion implantation of dopants passing through the first logic gate intothe substrate, control gate spacers formed on each sidewall of thecontrol gate and first logic gate spacers formed on each sidewall of thefirst logic gate, a first source region and a first drain region formedon opposite sides of the control gate, respectively, and a first logicsource region and a first logic drain region formed on opposite sides ofthe first logic gate, respectively.

The first logic well region may have a depth shallower below the firstlogic gate than a depth of the first logic well region with respect tothe first logic source region and the first logic drain region.

The first logic gate and the control gate may be formed in the sameoperation.

The semiconductor device may further include a deep well region formedin the substrate, wherein the deep well region may enclose the firstwell region, and a lightly doped drain (LDD) region formed in the firstwell region, wherein the LDD region may enclose the first source regionand the first drain region.

The semiconductor device may further include a second logic well regionformed by performing a second ion implantation of dopants passingthrough the second logic gate into the substrate, a second logic sourceregion and a second logic drain region on opposite sides of the secondlogic gate, respectively, and the second logic well region may have adepth shallower below the second logic gate than a depth of the secondlogic well region with respect to the second logic source region and thesecond logic drain region.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 illustrates a block diagram of a semiconductor device accordingto an example.

FIG. 2 illustrates a top view of a semiconductor device including an NVMand a logic device according to an example.

FIG. 3 illustrates a cross-sectional view along A-A′ line in FIG. 2 of asemiconductor device including an NVM and logic device according to anexample.

FIGS. 4A to 5B illustrate a manufacturing process of a floating gate ina semiconductor device according to an example.

FIGS. 6A to 8D illustrate a manufacturing process for forming a logicgate and a control gate in a semiconductor device according to anexample.

FIG. 9 illustrates a logic gate, floating gate and a control gate formedin a semiconductor device according to an example.

FIGS. 10 to 15 illustrate a manufacturing process for forming wellregions, LDD regions, source/drain regions and silicide layers in thelogic device and the NVM device according to an example.

Throughout the drawings and the detailed description, the same referencenumerals refer to the same elements. The drawings may not be to scale,and the relative size, proportions, and depiction of elements in thedrawings may be exaggerated for clarity, illustration, and convenience.

DETAILED DESCRIPTION

The following detailed description is provided to assist the reader ingaining a comprehensive understanding of the methods, apparatuses,and/or systems described herein. However, various changes,modifications, and equivalents of the methods, apparatuses, and/orsystems described herein will be apparent after an understanding of thedisclosure of this application. For example, the sequences of operationsdescribed herein are merely examples, and are not limited to those setforth herein, but may be changed as will be apparent after anunderstanding of the disclosure of this application, with the exceptionof operations necessarily occurring in a certain order. Also,descriptions of features that are known in the art may be omitted forincreased clarity and conciseness.

Throughout the specification, when an element, such as a layer, region,or substrate, is described as being “on,” “connected to,” or “coupledto” another element, it may be directly “on,” “connected to,” or“coupled to” the other element, or there may be one or more otherelements intervening therebetween. In contrast, when an element isdescribed as being “directly on,” “directly connected to,” or “directlycoupled to” another element, there can be no other elements interveningtherebetween.

As used herein, the term “and/or” includes any one and any combinationof any two or more of the associated listed items. For example, themeaning of “a first item, a second item and/or a third item” refers tocombinations of all items proposed not only from the first, second, orthird item, but also from two or more of the first, second, and thirditems.

Although terms such as “first,” “second,” and “third” may be used hereinto describe various members, components, regions, layers, or sections,these members, components, regions, layers, or sections are not to belimited by these terms. Rather, these terms are only used to distinguishone member, component, region, layer, or section from another member,component, region, layer, or section. Thus, a first member, component,region, layer, or section referred to in examples described herein mayalso be referred to as a second member, component, region, layer, orsection without departing from the teachings of the examples.

In each step, numerical symbols (for example, a, b, and c) are used forthe convenience of description, but do not explain the order of thesteps so that unless the context apparently indicates a specific order,the order may be different from the order described in thespecification. That is, the steps may be performed in the order asdescribed or simultaneously, or an opposite order.

Spatially relative terms such as “above,” “upper,” “below,” and “lower”may be used herein for ease of description to describe one element'srelationship to another element as shown in the figures. Such spatiallyrelative terms are intended to encompass different orientations of thedevice in use or operation in addition to the orientation depicted inthe figures. For example, if the device in the figures is turned over,an element described as being “above” or “upper” relative to anotherelement will then be “below” or “lower” relative to the other element.Thus, the term “above” encompasses both the above and below orientationsdepending on the spatial orientation of the device. The device may alsobe oriented in other ways (for example, rotated 90 degrees or at otherorientations), and the spatially relative terms used herein are to beinterpreted accordingly.

The terminology used herein is for describing various examples only, andis not to be used to limit the disclosure. The articles “a,” “an,” and“the” are intended to include the plural forms as well, unless thecontext clearly indicates otherwise. The terms “comprises,” “includes,”and “has” specify the presence of stated features, numbers, operations,members, elements, and/or combinations thereof, but do not preclude thepresence or addition of one or more other features, numbers, operations,members, elements, and/or combinations thereof.

Due to manufacturing techniques and/or tolerances, variations of theshapes shown in the drawings may occur. Thus, the examples describedherein are not limited to the specific shapes shown in the drawings, butinclude changes in shape that occur during manufacturing.

The features of the examples described herein may be combined in variousways as will be apparent after an understanding of the disclosure ofthis application. Further, although the examples described herein have avariety of configurations, other configurations are possible as will beapparent after an understanding of the disclosure of this application.

Expressions such as “first conductivity type” and “second conductivitytype” as used herein may refer to opposite conductivity types such as Nand P conductivity types, and examples described herein using suchexpressions encompass complementary examples as well. For example, anexample in which a first conductivity type is N and a secondconductivity type is P encompasses an example in which the firstconductivity type is P and the second conductivity type is N.

Herein, it is noted that use of the term “may” with respect to anexample or embodiment, e.g., as to what an example or embodiment mayinclude or implement, means that at least one example or embodimentexists where such a feature is included or implemented while allexamples and embodiments are not limited thereto.

Unless they are contrarily defined, all terms used herein includingtechnology or scientific terms have the same meaning as those generallyunderstood by a person with ordinary skill in the art after anunderstanding of the present disclosure. Terms which are defined in agenerally used dictionary should be interpreted to have the same meaningas the meaning in the context of the related art but are not interpretedas an ideally or excessively formal meaning if it is not clearly definedotherwise in the present disclosure.

The BCD device with NVM device has become increasingly important inapplications of automotive, wireless charger, moto driver integratedcircuit (IC), and so on. Herein, a technology for fabricating BCDdevices with NVM devices can be called as BCDN technology or BCDNprocess. In the BCDN technology or BCDN process, the EEPROM and logicdevice are embedded into a single chip, which requires many processsteps with number of masks. Simultaneously forming the EEPROM and logicdevice in the single chip is very complex due to a structural differencebetween the EEPROM and logic device.

To fabricate a logic device, several photo lithography masks arerequired for a formation of a NMOS gate electrode, and a PMOS gateelectrode as well as high voltage N-type deep well region (HNW), highvoltage P-type deep well region (HPW), logic N-type well region (NW),logic P-type well region (PW), N-type LDD region (NM), P-type LDD region(PM), source regions and drain regions, and so on.

Further, to fabricate the NVM device, such as an EEPROM, it alsorequires several photo lithography masks for formation of a tunnelinggate insulator, a floating gate, a control gate insulator, an ONOdielectric layer, hard mask patterns and a control gate, and so on.

To reduce a cost of manufacturing fabrication, an effort is helpful toreduce the number of masks which are used for the fabrication of EEPROMand logic device. The integration of the EEPROM and logic device in thesingle chip or integrated circuit (IC) may be challenging and becomeseven more problematic when making real-world attempts to do so.

An object of the present examples is to provide a semiconductor deviceincluding a nonvolatile memory device with logic device that may bemanufactured using a small number of photo mask processes and amanufacturing method of the same.

According to the nonvolatile memory device and a manufacturing method ofthe same, according to an example, the semiconductor device including alogic device and an NVM device in a single chip may be formed with areduced number of photo mask processes. Further, the processing stepsmay be reduced so that it is expected to reduce the cost formanufacturing the semiconductor device.

FIG. 1 illustrates a block diagram of a semiconductor device accordingto an example.

The semiconductor device may have many functional blocks, such as ananalog block, a control logic block, a memory cell array block, a randomaccess memory (RAM) block, a decoder block, a DC-DC converter block, asense amplifier block, a selector block, and so on. The functionalblocks may be integrated in a single chip 50. The memory cell array mayalso have a non-volatile memory (NVM) device, such as an EEPROM, a flashmemory, an EPROM, a Mask ROM, and so on, where the NVM device storesdata even when not actively powered on. The memory cell array may bedivided into a main cell region and a peripheral circuit region. Themain cell region may also have a plurality of NVM unit cells, forexample, a plurality of EEPROM unit cells. The peripheral circuit regionmay include logic transistors or logic devices. The control logic block,analog block , the sense amplifier block, the DC-DC converter block, thedecoder block, the RAM, and the selector block may also contain otherlogic transistors or other logic devices or BCD devices. The presentexamples show a manufacturing method in which the logic devices or BCDdevices are simultaneously fabricated on a single chip 50.

FIG. 2 illustrates a top view of a semiconductor device including an NVMand a logic device, according to an example.

Referring to the example of FIG. 2, a semiconductor device or integratedcircuit (IC) 50A may include, at least, a nonvolatile memory (NVM)device 100 and a logic device or BCD device 300 and 500. As shown in theexample of FIG. 1, the NVM device 100 may exist in the memory cell arrayof the semiconductor device or integrated circuit 50A. The logic deviceor BCD device 300 and 500 may exist in the region including the controllogic block, the analog block, the sense amplifier, the DC-DC theconverter, the decoder, the RAM, the selector, and so on. In such anexample, the NVM device 100 may comprise an EEPROM, an EPROM, a flashmemory, an OTP or an MTP, and so on. The logic device or BCD device 300and 500 may be, for example, a metal-oxide-semiconductor (MOS) device, aDMOS device, a bipolar junction transistor (BJT), or some other suitablelogic or BCD device. For example, the MOS or DMOS devices may include alow voltage device as well as a high voltage device or a medium voltagedevice. For example, the MOS devices may also include an NMOS device oran NMOS transistor 300 and a PMOS device or a PMOS transistor 500.

The NVM device 100 may be formed on a cell region 11. The cell region 11may have a plurality of unit cells such that a word line, a bit line anda source line are formed for programming, writing, erasing and readingoperations. The cell region 11 may have repeated EEPROM unit cells. Thecell region 11 may also be referred to as a memory cell array. The logicdevice or BCD device 300 and 500 may be formed on a logic region or BCDregion 12. In some examples, the logic region or BCD region 12 may belocated at a logic region of the IC and/or at a periphery of the ICand/or at a periphery of the cell region 11. Further, the logic or BCDdevice 300 and 500 may overlie a logic well region or a BCD well region310 and 510 in the logic region or the BCD region 12.

Referring to the example of FIG. 2, the NVM device 100 may include firstand second floating gates FG1 and FG2 and control gates CG1 and CG2, aswell as NVM well regions 17 and 18. The first and second floating gatesFG1 and FG2 may be enclosed by the first and second control gates CG1and CG2, respectively. The NVM device 100 may further include sourceregions 130 and drain regions 140 to interconnect source lines SL0, SL1,SL2 and bit lines BLO, BL1, BL2, respectively. Further, the logic device300 and 500 may include the logic gates LG1 and LG2 and source/drainregions 330, 340, 530 and 540, as well as logic well regions 310 and510. Each device may be isolated even though adjacent to another deviceby the presence of isolation region 13. For example, an active regionmay be enclosed by the isolation region.

FIG. 3 shows a cross-sectional view along A-A′ line in the example ofFIG. 2 of a semiconductor device including an NVM and logic device,according to an example.

Referring to the example of FIG. 3, the NVM device 100 may include adeep N-type well (DNW) region 17 formed in the cell region 11 and aP-type well (HPW) region (first well region) 18 formed on the DNW region17. Accordingly, the DNW region 17 may enclose the HPW region or firstwell region 18 to isolate the HPW region from the substrate 10. The NVMdevice 100 further includes three N-type LDD (HNM) regions 120 formed inthe HPW region 18 and a common source region 130 formed in one of theHNM region 120 and drain regions 140 formed in the other two HNM regions120. In such an example, the common source region 130 may be formedbetween the first floating gate FG1 and the second floating gate FG2.

Referring to the example of FIG. 3 , the NVM device 100 may furtherinclude a tunneling gate insulator 20 and a control gate insulator 30formed on the substrate 10, first and second floating gates FG1 and FG2formed on the tunneling gate insulator 20, a first hard mask pattern 25formed on a top surface of the first and second floating gates FG1 andFG2, a thick dielectric pattern or ONO dielectric layer 27 formed onsidewalls of the first and second floating gates FG1 and FG2, and firstand second control gates CG1 and CG2 formed on the control gateinsulator 30. The thick dielectric pattern 27 may be disposed betweenthe floating gate FG1 or the floating gate FG2 and the control gate CG1or the control gate CG2. Thus, each of the control gates may beinsulated from each of the floating gates FG1 and FG2 by the thickdielectric pattern 27. In such an example, the ONO dielectric layer orthick dielectric pattern 27 refers to an oxide(O)/nitride(N)/oxide(O)stacked film.

Referring to the example of FIG. 3, the NVM device 100 may furtherinclude control gate sidewall spacers 150 formed on the sidewalls of thecontrol gates, silicide layers 160 formed on a top surface of thesubstrate 10 or on the source and drain regions 140 and 130, andsilicide layers 170 formed on a top surface of the control gates.

In the NVM device 100, the tunneling gate insulator 20 and the controlgate insulator 30 may be formed by thermal oxidation. The tunneling gateinsulator 20 may have a thickness thinner than a thickness of thecontrol gate insulator 30. The first and second floating gates FG1 andFG2 and the first and second control gates CG1 and CG2 may includepolysilicon material. Also, the first and second floating gates FG1 andFG2 and the first and second control gates CG1 and CG2 may be formed bya low pressure chemical vapor deposition (LPCVD) method. The first andsecond control gates CG1 and CG2 may include metal layers, such astungsten (W) or tantalum (Ta) or titanium nitride (TiN) in order todecrease the resistivity of the gate electrode. The first hard maskpattern 25 may include a stacked film structure, such as a structureincluding a nitride film formed on an oxide film, that is, SiN/SiO2. Thefirst hard mask pattern 25 may be used as a mask for the patterning ofthe first and second floating gates FG1 and FG2.

The thick dielectric pattern 27 may be disposed between the first andsecond floating gates FG1 and FG2 and the first and second control gatesCG1 and CG2. Thus, the sidewalls of the first and second floating gatesFG1 and FG2 may be enclosed by the thick dielectric pattern 27, and atop surface of the first and second floating gates FG1 and FG2 may be indirect contact with the hard mask pattern 25. Accordingly, the first andsecond floating gates FG1 and FG2 are fully enclosed by insulatinglayers, such as the thick dielectric pattern 27 and the first hard maskpattern 25.

The control gate insulator 30 may be used as a gate dielectric layer forthe first and second control gates CG1 and CG2. The control gateinsulator 30 may include a thermal oxide film, such as either one orboth of an SiO2 film and an SiON film, as non-limiting examples. Thethermal oxide film may have minimized interface defects at the interfacebetween the gate electrode and the substrate, which may result in arelatively low leakage current. The thermal oxide film, formed of SiO2in a non-limiting example, also may have a high band gap characteristicand may minimize the generation of hot electrons. In one example, ahigh-k material such as Hafnium Oxide (HfO₂), Aluminum Oxide (Al₂O₃),Tantalum Oxide (Ta₂O₅),and so on, as non-limiting examples, may be usedfor the control gate insulator 30. When such a high-k material is used,a capacitance may be increased and a coupling efficiency may bemaximized.

Each of the first and second floating gates FG1 and FG2 may be disposedon a top surface of the substrate 10 in the cell region 11 and may beenclosed by each of the first and second control gates CG1 and CG2. Inone example, the first floating gate FG1 may be disposed betweenportions of the first control gate CG1. In a similar manner, the secondfloating gate FG2 may be disposed between portions of the second controlgate CG2. Also, the first and second floating gates FG1 and FG2 may beconnected to a word line.

The first and second control gates CG1 and CG2 may be disposed on thecontrol gate insulator 30 formed on a top surface of the substrate 10 inthe cell region 11 in order to enclose the first and second floatinggates FG1 and FG2, respectively. The first and second control gates CG1and CG2 may enclose all the floating gates FG1 while having the sameheight. Depending on the manufacturing process, the first and secondcontrol gates CG1 and CG2 may have a different height from that of thelogic gates LG1 and LG2. For example, the first and second control gatesCG1 and CG2 may have a height higher than a height of the logic gatesLG1 and LG2.

Referring to the example of FIG. 3, the logic devices 300 and 500 mayinclude an NMOS device and a PMOS device. In such an example the NMOSdevice 300 may include a first logic P-type well (PW) region 310 formedin the logic region 12, N-type LDD (NLDD) regions 320 formed in thefirst logic PW region 310, a first logic N-type source region 330 and afirst logic N-type drain region 340 formed in the first logic PW region310, a first logic gate insulator 301 formed on the substrate 10, afirst logic gate LG1 formed on the first logic gate insulator 301, firstlogic gate spacers 350 formed on sidewalls of the first logic gate LG1,silicide layers 360 formed on the N-type source and N-type drain regions330 and 340, and silicide layers 370 formed on a top surface of thefirst logic gate LG1.

Referring to the example of FIG. 3, the PMOS device 500 may include asecond logic N-type well (NW) region 510 formed in the logic region 12,P-type LDD (PLDD) regions 520 formed in the second logic NW region 510,a second logic P-type source region 530 and a second logic P-type drainregion 540 formed in the second logic NW region 510, a second logic gateinsulator 501 formed on the substrate 10; a second logic gate LG2 formedon the second logic gate insulator 501, second logic gate spacers 550formed on sidewalls of the second logic gate LG2, silicide layers 560formed on the P-type source and P-type drain regions 530 and 540, andsilicide layers 570 formed on a top surface of the second logic gateLG2.

A depth of the first logic PW region 310 below the first logic gate LG1may be shallower than a depth of the first logic PW region 310 below thefirst logic N-type source region 330 and the first logic N-type drainregion 340. A depth of the first logic PW region 310 below the firstgate electrode may also be shallower than a depth of the first logic PWregion 310 below the isolation region 13. In the same manner, a depth ofthe second logic NW region 510 below the second logic gate LG2 may beshallower than a depth of the second logic NW region 510 below thesecond logic P-type source region 530 and below the second logic P-typedrain region 540. A depth of the second logic NW region 510 below thesecond logic gate LG2 may be shallower than a depth of the second logicNW region 510 below the isolation region 13.

The different depth as mentioned above may be due to the ionimplantation processes for the first logic PW region 310 and the secondlogic NW region 510 being performed after formation of the gateelectrodes LG1 and LG2. Dopants may pass through the first logic gateLG1 and the second logic gate LG2 when the ion implantation processes isperformed. However, the formation of the DNW region 17 and the HPWregion 18 is performed before formation of the floating gate electrodeFG1 and FG2. Therefore, the depth profiles of the DNW region 17 and theHPW region 18 may be different from those of the PW and NW regions 310and 510. Accordingly, the depth profiles of the DNW region 17 and theHPW region 18 below the floating gate electrode FG1 and FG2 may bedeeper than a depth profile of the DNW region 17 and the HPW region 18below the source/drain regions 130/140.

FIGS. 4A to 5B illustrate a manufacturing process of a floating gate ina semiconductor device according to an example.

Referring to the example of FIG. 4A, in the NVM device 100, isolationregions 13 may be formed in the substrate 10. A deep N-type well (DNW)region 17 may be formed in the cell region 11 of the substrate 10. AP-type well (HPW) region or first well region 18 is formed on the DNWregion 17. In such a manner, the DNW region 17 may enclose the HPWregion or first well region 18 in order to isolate the HPW region fromthe substrate 10.

Referring to the example of FIG. 4A, a tunneling gate insulator 20 maybe formed on an entire surface of the logic region 12 and the cellregion 11 of the substrate 10. In this example, the tunneling gateinsulator 20 may be formed by any one of a silicon oxide film SiO₂, asilicon nitride film SiN, and a silicon oxynitride film SiON, or a stackof such film materials, as non-limiting examples. A first conductivefilm 21 may be deposited on the tunneling gate insulator 20. The firstconductive film 21 may be formed as a single polysilicon layer or as astacked metal/polysilicon layer in which a metal layer is laminated onpolysilicon. Then, N-type dopants 80 may be implanted into the firstconductive film 21 to distribute the N-type dopants 80 into the firstconductive film 21. After ion implantation 80, an annealing process maybe performed to activate the N-type dopants distributed in the firstconductive film 21, resulting in an N-type conductivity first conductivefilm 21 being formed.

Referring to the example of FIG. 4B, a first insulating layer 25-1 and asecond insulating layer 25-2 may be deposited on the first conductivefilm 21 by the LPCVD method, and then a PR mask pattern 91 may be formedon the second insulating layer 25-2 to pattern the first insulatinglayer 25-1 and the second insulating layer 25-2. The first insulatinglayer 25-1 may include a silicon oxide layer. The second insulatinglayer 25-2 may include a silicon nitride layer. Additionally, a plasmaetching process may be performed on the first insulating layer 25-1 andthe second insulating layer 25-2 in order to form a first hard maskpattern 25 by using the PR mask pattern 91 as a mask.

Referring to the example of FIG. 4C, a further plasma etching process isperformed on the first conductive film 21 in order to form a firstfloating gate FG1 and a second floating gate FG2 by using the first hardmask pattern 25 as an etching mask. In such an example, a first hardmask pattern 25 may be formed above the first and second floating gatesFG1 and FG2 to protect the first and second floating gates FG1 and FG2during the subsequent etching process. The first hard mask pattern 25may include a stacked film that combines the silicon oxide film 25-1 andthe silicon nitride film 25-2. Furthermore, in such an example, the PRmask pattern 91 may be consumed and may disappear during the plasmaetching processes mentioned above. In the cell region 11, the tunnelinggate insulator 20 and the first and second floating gates FG1 and FG2may be formed, but in the logic region 12, the first conductive film 21may be removed by the plasma etching process.

Referring to the example of FIG. 5A, a first silicon oxide layer 27-1, asecond silicon nitride layer 27-2 and a third silicon oxide layer 27-3may be sequentially deposited on the first and second floating gates FG1and FG2 and the first hard mask pattern 25 in order to form a thickdielectric pattern 27. The first silicon oxide layer 27-1 may be formedby thermal oxidation at a high temperature, resulting in a thermal oxidebeing formed on sidewalls of the floating gates FG1 and FG2. The secondsilicon nitride film 27-2 and the third silicon oxide layer 27-3 may beformed by a LPCVD method.

Referring to the example of FIG. 5B, an etch-back process may beperformed with respect to the third silicon oxide layer 27-3, the secondsilicon nitride layer 27-2 and the first silicon oxide layer 27-1,resulting in ONO dielectric layer or thick dielectric pattern 27 beingformed on each of the sidewalls of the floating gates FG1 and FG2.Therefore, the thick dielectric pattern 27 may be formed by patterningthe first silicon oxide layer 27-1, the second silicon nitride layer27-2 and the third silicon oxide layer 27-3. The thin oxide layer 20located outside the thick dielectric pattern 27 and the floating gatesFG1 and FG2 may be totally etched and may disappear after furthersubsequent processing.

FIGS. 6A to 8D illustrate a manufacturing process for forming a logicgate and a control gate in a semiconductor device according to anexample.

Referring to the example of FIG. 6A, a control gate insulator 30 may beformed on the semiconductor substrate and on the first and secondfloating gates FG1 and FG2 having the first hard mask pattern 25, and onthe thick dielectric pattern 27. Such a control gate insulator 30 may beformed as any one of a silicon oxide film, a silicon nitride film, and asilicon oxy nitride film or a stack of such films, as non-limitingexamples. The control gate insulator 30 may be used as a gate insulatorfor both the first and second control gates CG1 and CG2.

Referring to the example of FIG. 6B, a PR mask pattern 92 may be formedon the control gate insulator 30 and then wet etching process 81 may beperformed to selectively remove the control gate insulator 30 in thelogic region 12 by using the PR mask pattern 92 as a mask. In such anexample, a thin oxide layer 30a may remain on the silicon substrateafter the wet etching process. Then, the PR mask pattern 92 may beremoved by a plasma ashing process.

Referring to the example of FIG. 6C, the remaining thin oxide layer 30ain the example of FIG. 6B may be completely removed to form a thin gateinsulator 35 on the substrate in the logic region. Such a thin gateinsulator 35 may be selectively formed on the substrate in logic region12 by using a thermal oxidation process. The thin gate insulator 35 maybe used as a gate dielectric layer for logic devices 300 and 500.Subsequently, a second conductive film 40 may be deposited on the wholesubstrate. Thus, the second conductive film 41 may be formed on thecontrol gate insulator 30 and the thin gate insulator 35. An upperportion and a sidewall of the first and second floating gates FG1 andFG2 may be additionally enclosed by the second conductive film 40. Thesecond conductive film 40 may be used for the control gate CG and may bealso formed using a single polysilicon layer or a stacked metalpolysilicon layer in which a metal layer is laminated onto polysilicon.Such a second conductive film 40 may have a groove shape located betweenthe first floating gate FG1 and the second floating gate FG2.

Referring to the example of FIG. 7A, a first protective film 65 may bedeposited on the second conductive film 40, and a second protective film71 may be subsequently deposited on the first protective film 65. Thetwo protective films may be deposited to make a second hard mask pattern70 that may be used for formation of logic gates, as shown in furtherdetail in FIG. 7B. The first protective film 65 may include a siliconoxide film that is deposited using a tetraethyl orthosilicate (TEOS)material by an LPCVD method. The second protective film 71 may include asilicon nitride (SiN) film or a silicon oxynitride (SiON) film that hasincludes different material from the first protective film 65, so as toprovide an etch selectivity. The first protective film 65 may be formedon the second conductive film 40 and may protect the second conductivefilm 40 in a subsequent etching process. The first protective film 65and the second protective film 71 may also protect an upper portion ofthe first and second floating gates FG1 and FG2 in the subsequentetching process, and they may be removed in a final step.

Referring to the example of FIG. 7A, a PR mask pattern 93 may be formedon the second protective film 71 in the logic region 12. For example,the PR mask pattern 93 may be formed in a part of the logic region 12 inorder to create a second hard mask pattern 70. Also, the PR mask pattern93 may not be formed in the cell region 11, as shown in the example ofFIG. 7A.

According to the example of FIG. 7B, a plasma etching process may beperformed on the second protective film 71 and the first protective film65 by using the PR mask pattern 93 to form a second hard mask pattern70. In such an example, the second hard mask pattern 70 may be formed onthe second conductive film 40 in the logic region 12. The second hardmask pattern 70 may also serve as a mask to form logic gates in asubsequent etching process.

According to the example of FIG. 7B, the second protective film 71 andthe first protective film 65 may still remain as a spacer shapeinsulating layer 60 on sidewalls of the second conductive film 40 in thecell region 11 after the plasma etching process occurs. The spacer shapeinsulating layer 60 may also be formed on sidewalls of the secondconductive film 40 in the cell region 11 after the plasma etchingprocess occurs. The first protective film 65 and the second protectivefilm 71 may be transformed into the spacer shape insulating layer 60. Insuch an example, there may be no PR mask pattern in the cell region 11.Thus an etch-back process may be performed in the cell region 11 duringthe plasma etching process, resulting in formation of the spacer shapeinsulating layer 60. After the plasma etching process occurs, an upperportion of the second conductive film 40 that overlaps with the firstand second floating gates FG1 and FG2 may be exposed as shown in theexample of FIG. 7B. If the second conductive film 40 is entirelyremoved, the first and second floating gates FG1 and FG2 may beprotected by the first hard mask pattern 25 during the plasma etchingprocess, because the first hard mask pattern 25 may still remain on thefirst and second floating gates FG1 and FG2, according to the presentexample.

Referring to the example of FIG. 8A, a PR mask pattern 94 may be formedto cover the second hard mask pattern 70 as well as the secondconductive film 40 in the logic region 12. However, the PR mask pattern94 may not be formed in the cell region 11.

Referring to the example of FIG. 8B, a wet etching process 82 may beperformed to remove the spacer shape insulating layer 60 formed on thesidewalls of the second conductive film 40 in the cell region 11. Thewet etching process 82 may be performed using chemical etchants, such asa Buffered oxide etch (BOE) solution, as a non-limiting example. BOE,also known as buffered HF or BHF, is a wet etchant used inmicrofabrication. Its primary use is in etching thin films of silicondioxide (SiO₂) or silicon nitride (Si₃N₄). BOE is a mixture of abuffering agents, such as ammonium fluoride (NH₄F), and hydrofluoricacid (HF), as non-limiting examples. Accordingly, the second sidewallspacer 60 may be removed by using the chemical etchants.

As illustrated in the example of FIG. 8C, after the wet etching process,an ion implantation 83 using N-type dopants into the second conductivefilm 40 may be performed. In order to ensure an erasable characteristicof the cell, the N-type dopants may be doped into the second conductivefilm 40 to cause the second conductive 40 to be transformed into beingfirst and second control gates CG1 and CG2 in the cell region 11. Theion implantation process 83 may be performed on the second conductivefilm 40 using the PR mask pattern 94 that is the same PR mask pattern asthat used for the wet etching process 82, thereby reducing a cost andshortening a processing time period.

After ion implantation processing, as described in further detail above,the PR mask pattern 94 may be removed using plasma ashing. Then,annealing process may be performed at a high temperature in order toactivate the implanted N-type dopants distributed in the secondconductive film 40.

FIG. 8D illustrates a step of simultaneously forming the first andsecond control gates CG1 and CG2 and the logic gates LG1 and LG2 in thecell region 11 by using a plasma etching process.

Referring to the example of FIG. 8D, the plasma etching process may beperformed on the second conductive film 40 without using a new PR maskpattern, that is, a blanket etching process or an etch-back process.Instead, the second hard mask pattern 70 as a mask may be used to formlogic gates LG1 and LG2 in the logic region 12. In this manner, thelogic gates LG1 and LG2 may be formed on the first logic gate insulator301 in the logic region 12. The second hard mask pattern 70 may beconsumed and disappears during the patterning of the second conductivefilm 40. Alternatively, the remaining second hard mask pattern 70 may beremoved after patterning the second conductive film 40.

FIG. 9 illustrates a logic gate, floating gate and a control gate formedin a semiconductor device, according to an example.

As illustrated in the example of FIG. 9, the first and second controlgates CG1 and CG2 are simultaneously formed on the sidewalls of thefirst and second floating gates FG1 and FG2 in the cell region 11, aswell as the logic gates LG1 and LG2 formed in the logic region 12, afterthe third dry etching process. The plasma etching process may be anetch-back process. In such an example, the first and second controlgates CG1 and CG2 may be formed on sidewall of the first and secondfloating gates FG1 and FG2 by the etch-back process, resulting information of a spacer shape including first and second control gates CG1and CG2.

As illustrated in the example of FIG. 9, during the plasma etchingprocess, the control gate insulator 30 formed on the first hard maskpattern 25 may be exposed because the second conductive film 40 formedon the control gate insulator 30 is removed in the cell region 11, insuch an example. In a worst case, the second conductive film 40 may bewholly removed from a sidewall of the first and second floating gatesFG1 and FG2 in the cell region 11 during the third dry etching process,because of a difference in etching rates between the second conductivefilm 40 and the second hard mask pattern 70. An over-etching of thesecond conductive film 40 in the cell region 11 may occur during thethird dry etching process, although the second conductive film 40 in thelogic region 12 may be protected by the second hard mask pattern 70. Ifa sufficient thickness of the hard mask pattern 25 is secured, a heightof the second conductive film 40 formed over the hard mask pattern 25may increase. In that example, side portions of the second conductivefilm 40 formed on sidewall of the first and second floating gates FG1and FG2 may not be wholly removed in the cell region 11 during the thirddry etching process, although a top portion of the second conductivefilm 40 formed on top surface of the first and second floating gates FG1and FG2 may be wholly removed in the cell region 11. In that example, aheight of the control gate CG1 and CG1 may be greater than a height ofthe first and second floating gates FG1 and FG2 with respect to a topsurface of the substrate 10. Alternatively, a top surface of the firstand second control gates CG1 and CG2 may be positioned higher than a topsurface of the first and second floating gates FG1 and FG2. Therefore,in order to maintain a height of the control gate as being greater thana height of the first and second floating gates FG1 and FG2, asufficient thickness of the first hard mask pattern 25 may be securedand accordingly desired electrical characteristics may be achieved.

Further, a thickness of the first hard mask pattern 25 of the presentexample of FIG. 3 may be similar to or smaller than the thickness of thefirst and second floating gates FG1 and FG2. Additionally, the thicknessof the first hard mask pattern 25 of the present example of FIG. 3 maybe the same as the thickness of the logic gates LG1 and LG2 of the logicregion 12.

Depending on the thickness of the first hard mask pattern 25 in thepresent example, a top surface of the first and second control gates CG1and CG2 may be positioned below a top surface of the first and secondfloating gates FG1 and FG2 due to the excessive etched quantity. In thisexample, coupling capacitances may vary between the first and secondfloating gates FG1 and FG2 and the control gate CG1 and CG2, which mayadversely affect the program and the erasable characteristic of thecell.

In the present example of FIG. 9, a difference in etching rates mayexist between the second conductive film 40 and the second hard maskpattern 70 and such a difference in etching rates may be used tosimultaneously form the control gate CG1 and CG2 in the cell region 11and the logic gate LG1 and LG2 in the logic region 12.

Further, in order to suppress the over-etching of the second conductivefilm 40 where the control gate is to be formed, the first hard maskpattern 25 above the first and second floating gates FG1 and FG2 may beformed to be thick, so that the thicknesses of the first and secondcontrol gates CG1 and CG2 may not be lower than the thickness of thefirst and second floating gates FG1 and FG2. That is, the thickness ofthe first and second floating gates FG1 and FG2 may be equal to orlarger than the thickness of the first hard mask pattern 25. Thus, insuch an example, the insulating layers may be formed between the firstand second floating gates FG1 and FG2 and the first and second controlgates CG1 and CG2. Also, a same conductive material such as apolysilicon layer may be used for the first and second floating gatesFG1 and FG2 and the first and second control gates CG1 and CG2.According to the present example of FIG. 9, the control gate formed inthe edge area of the memory device, for example, an EEPROM as anon-limiting example, does not have a protruding portion or a landingportion so that the size of the memory device may be reduced as aresult. Further, the logic gates and the control gates may be formed asonly having a reduced number of masks patterned, thus having a reducednumber of processes as compared with the number of processes used in thefirst example. Further, the process steps may be reduced so that it maybe expected to reduce the cost for manufacturing the nonvolatile memorydevice in the second example.

FIGS. 10 to 15 illustrate a manufacturing process for forming wellregions, LDD regions, source/drain regions, and silicide layers in thelogic device and the NVM device, according to an example.

Referring to the example of FIG. 10, a PR mask pattern 95 may be formedto cover the logic region 12 and to open the cell region 11 to formN-type LDD (HNM) regions 120 in the P-type well (HPW) region 18. Afterforming the PR mask pattern 95, an ion implantation using N-type dopantsmay be performed into the P-type well (HPW) region 18. The N-type LDD(HNM) regions 120 may be aligned with respect to the first and secondcontrol gates CG1 and CG2. Then, the PR mask pattern 95 may be removedby a plasma ashing process.

Referring to the example of FIG. 11, a new PR mask pattern 96 may beformed to cover the cell region 11 and a part of the logic region 12, inorder to form a first logic P-type well (PW) region 310 and N-type LDD(NM) regions 320. In such an example, the part of the logic region 12covered by the PR mask pattern 96 may be an area which the PMOStransistor 500 is formed. The PR mask pattern 96 may open an area inwhich the NMOS transistor 300 is formed. After forming the PR maskpattern 96, a first ion implantation of P-type dopants having highimplantation energy may be performed into the substrate 10 in order toform the first logic P-type well (PW) region 310 using the PR maskpattern 96. The dopants may pass through the first logic gate LG1 duringthe ion implantation process, so a depth profile of the first logicP-type well (PW) region 310 may not be coplanar.

Referring to the example of FIG. 11, a second ion implantation of N-typedopants having low implantation energy using the same PR mask pattern 96as the first ion implantation may be further performed in order to formthe N-type LDD (NM) regions 320. In such an example, the N-type LDD (NM)regions 320 may be aligned with respect to the first logic gate LG1.Then, the PR mask pattern 96 may be removed by a plasma ashing process.

A depth of the first logic PW region 310 below the first logic gate LG1may be shallower than a depth of the first logic PW region 310 below theN-type LDD regions 320. Also, a depth of the first logic PW region 310below the first gate electrode may be shallower than a depth of thefirst logic PW region 310 below the isolation region 13.

Referring to the example of FIG. 12, a PR mask pattern 97 may be formedto cover the cell region 11 and another part of the logic region 12 inorder to form a second logic N-type well (NW) region 510 and P-type LDD(PM) regions 520. In such an example, another part of the logic region12 covered by the PR mask pattern 97 may be an area which the NMOStransistor 300 is formed. The PR mask pattern 97 may open an area inwhich the PMOS transistor 500 is formed. After forming the PR maskpattern 97, a third ion implantation of N-type dopants having highimplantation energy may be performed into the substrate 10 in order toform the second logic N-type well (NW) region 510 using the PR maskpattern 97. The dopants may pass through the second logic gate LG2during the ion implantation, so a depth profile of the second logicN-type well (NW) region 510 may not be coplanar.

Referring to the example of FIG. 12, a fourth ion implantation of P-typedopants having low implantation energy using the same PR mask pattern 97as the third ion implantation may be performed in order to form theP-type LDD (PM) regions 520. In such an example, the P-type LDD (PM)regions 520 may be aligned with respect to the second logic gate LG2.Then, the PR mask pattern 97 may be removed by a plasma ashing process.

A depth of the second logic NW region 510 below the second logic gateLG2 may be shallower than a depth of the second logic NW region 510below the P-type LDD regions 520. A depth of the second logic NW region510 below the second logic gate LG2 may be shallower than a depth of thesecond logic NW region 510 below the isolation region 13.

Referring to the example of FIG. 13, control gate spacers 150 may beformed on sidewalls of the control gates CG1 and CG2 in cell region 11.Further, first logic gate spacers 350 and second logic gate spacers 550may also be formed on sidewalls of logic gates LG1 and LG2 in logicregion 12. During the formation of the spacers 150, 350 and 550, thefirst logic gate insulator 301 and the control gate insulator 30 may beremoved from outside of the logic gates LG1 and LG2 and the controlgates CG1 and CG2.

Referring to the example of FIG. 14, an N-type common source region 130may be formed in one of the N-type LDD (HNM) regions 120 in the cellregion 11, wherein the N-type common source region 130 may be disposedbetween the first floating gate FG1 and the second floating gate FG2.Further, two N-type drain regions 140 may be formed in the other twoN-type LDD (HNM) regions 120, respectively. The N-type common sourceregion 130 and two N-type drain regions 140 may be aligned with respectto the control gate spacers 150 formed on the sidewalls of the controlgates CG1 and CG2.

Referring to the example of FIG. 14, a first logic N-type source region330 and a first logic N-type drain region 340 may be formed in the inthe first logic P-type well (PW) region 310 in the logic region 12. In asimilar manner, a second logic P-type source region 530 and a secondlogic P-type drain region 540 may be formed in the in the second logicN-type well (NW) region 510 in the logic region 12. The logic sourceregions 340 and 530 and the logic drain regions 340 and 540 may bealigned with respect to the first logic gate spacers and second logicgate spacers 350, 550 formed on the sidewalls of the logic gates LG1 andLG2. The N-type common source region 130, the N-type common sourceregion 130, the first logic N-type source region 330 and the first logicN-type drain region 340 may be formed simultaneously in the substrate10.

Referring to the example of FIG. 15, a salicide process may be performedin order to form silicide layers 160, 170, 360, 370, 560 and 570 formedon the exposed source/drain regions 130, 140, 330, 340, 530 and 540 andon the exposed logic gates LG1 and LG2 and on the exposed control gatesCG1 and CG2. After the salicide process, a borderless contact (BLC)layer such as an SiO2 or an SiON layer, as non-limiting examples, andinter-layer dielectric (ILD) layers such as phosposilicate glass (PSG),borophosphosilicate glass (BPSG), or tetraethyl orthosilicate (TEOS),and so on, as non-limiting examples, are sequentially formed on theentire semiconductor device 50A. Source/drain/gate contact plugs areformed after selectively etching the BLC layer and ILD layers to contactthe silicide layers.

While this disclosure includes specific examples, it will be apparentafter an understanding of the disclosure of this application thatvarious changes in form and details may be made in these exampleswithout departing from the spirit and scope of the claims and theirequivalents. The examples described herein are to be considered in adescriptive sense only, and not for purposes of limitation. Descriptionsof features or aspects in each example are to be considered as beingapplicable to similar features or aspects in other examples. Suitableresults may be achieved if the described techniques are performed in adifferent order, and/or if components in a described system,architecture, device, or circuit are combined in a different manner,and/or replaced or supplemented by other components or theirequivalents. Therefore, the scope of the disclosure is defined not bythe detailed description, but by the claims and their equivalents, andall variations within the scope of the claims and their equivalents areto be construed as being included in the disclosure.

What is claimed is:
 1. A semiconductor device, comprising: a nonvolatilememory device, comprising: a first well region formed in a substrate, atunneling gate insulator formed on the first well region, a floatinggate formed on the tunneling gate insulator, a control gate insulatorformed on the substrate, a control gate formed on the control gateinsulator, and a first source region and a first drain region formed onopposite sides of the control gate, respectively; and a first logicdevice, comprising: a first logic well region formed in the substrate, afirst logic gate insulator formed on the first logic well region, afirst logic gate formed on the first logic gate insulator, wherein thefirst logic gate comprises substantially a same material as a materialof the control gate of the nonvolatile memory device, and a first logicsource region and a first logic drain region formed on opposite sides ofthe first logic gate, respectively, wherein the first logic well regionhas a depth shallower with respect to the first logic gate than a depthof the first logic well region with respect to the first logic sourceregion and the first logic drain region.
 2. The semiconductor device ofclaim 1, further comprising: a second logic device, comprising: a secondlogic well region formed in the substrate; a second logic gate insulatorformed on the second logic well region; a second logic gate formed onthe second logic gate insulator, wherein the second logic gate comprisessubstantially a same material as the material of the control gate of thenonvolatile memory device; and a second logic source region and a secondlogic drain region formed on opposite sides of the second logic gate,respectively, wherein the second logic well region has a depth shallowerwith respect to the second logic gate than a depth of the second logicwell region with respect to the second logic source region and thesecond logic drain region.
 3. The semiconductor device of claim 1,wherein the control gate insulator has a thickness greater than athickness of the first logic insulator and greater than a thickness ofthe second logic gate insulator.
 4. The semiconductor device of claim 1,wherein the nonvolatile memory device further comprises: a hard maskpattern formed on the floating gate; a thick dielectric pattern formedbetween the floating gate and the control gate; control gate spacersformed on sidewalls of the control gate; and a first silicide layerformed on the control gate.
 5. The semiconductor device of claim 1,wherein the nonvolatile memory device further comprises: a deep wellregion formed below the first well region, wherein the deep well regionhas a depth greater than a depth of the first logic well region; and alightly-doped drain (LDD) region formed in the first well region,wherein the LDD region has a depth greater than a depth of the firstsource region and greater than a depth of the first drain region.
 6. Thesemiconductor device of claim 1, wherein the control gate has a heightgreater than a height of the first logic gate with respect to a topsurface of the substrate.
 7. A manufacturing method of a semiconductordevice, the manufacturing method comprising: forming a nonvolatilememory device, comprising: forming a first well region in a substrate,forming a tunneling gate insulator on the first well region, forming afloating gate on the tunneling gate insulator, forming a thickdielectric pattern formed on sidewalls of the floating gate, forming acontrol gate insulator on the substrate, forming a control gate on thecontrol gate insulator, and forming a first source region and a firstdrain region on opposite sides of the control gate, respectively; andforming a first logic device, comprising: forming a first logic gateinsulator on the substrate, forming a first logic gate on the firstlogic gate insulator, wherein the first logic gate and the control gateare formed in the same operation, forming a first logic well region byperforming a first ion implantation of dopants passing through the firstlogic gate into the substrate, forming first logic gate spacers formedon sidewalls of the first logic gate, and forming a first logic sourceregion and a first logic drain region on opposite sides of the firstlogic gate, respectively, wherein the first logic well region has adepth shallower below the first logic gate than a depth of the firstlogic well region with respect to the first logic source region and thefirst logic drain region.
 8. The method of claim 7, wherein the forminga nonvolatile memory device further comprises: forming control gatespacers on sidewalls of the control gate; and forming a first silicidelayer on the control gate.
 9. The method of claim 7, wherein the forminga nonvolatile memory device further comprises: forming a deep wellregion in the substrate, wherein the deep well region has a depthgreater than a depth of the first well region and greater than a depthof the first logic well region; and forming a lightly-doped drain (LDD)region in the first well region, wherein the LDD region has a depthgreater than a depth of the first source region and greater than a depthof the first drain region.
 10. The method of claim 7, wherein theforming of a floating gate on the tunneling gate insulator comprises:forming a first conductive film on the tunneling gate insulator; forminga first hard mask pattern on the first conductive film; and performingan etching of the first conductive film using the first hard maskpattern as a mask, thereby forming the floating gate on the tunnelinggate insulator, wherein the first hard mask pattern remains on a topsurface of the floating gate.
 11. The method of claim 7, wherein theforming a control gate on the control gate insulator comprises:depositing a second conductive film on the control gate insulator andthe floating gate; and patterning the second conductive film using anetch-back process, thereby forming the control gate on the control gateinsulator and on sidewalls of the thick dielectric pattern, wherein nocontrol gate is formed on a top surface of the floating gate.
 12. Themethod of claim 11, wherein the forming a control gate on the controlgate insulator further comprises: depositing a stacked layer on thesecond conductive film; patterning the stacked layer, thereby forming astacked layer pattern on sidewalls of the second conductive film;removing the stacked layer pattern by wet etching using chemicaletchants; and implanting dopants into the second conductive film. 13.The method of claim 7, wherein the forming the first logic gate on thefirst logic gate insulator comprises: forming the logic gate insulatoron the substrate; forming a second conductive film on the logic gateinsulator; forming a second hard mask pattern on the second conductivefilm; and patterning the second conductive film, using the second hardmask pattern, to form the first logic gate on the first logic gateinsulator.
 14. The method of claim 7, wherein the control gate is formedto enclose the floating gate.
 15. A manufacturing method of asemiconductor device, the manufacturing method comprising: preparing asubstrate comprising a cell region and a logic region, wherein anonvolatile memory device is formed on the cell region and a logicdevice is formed on the logic region; forming a first well region in thecell region of the substrate; forming a tunneling gate insulator on thefirst well region; forming a first conductive film on the tunneling gateinsulator; patterning the first conductive film, thereby forming afloating gate on the tunneling gate insulator; forming a thickdielectric pattern on sidewalls of the floating gate; forming a controlgate insulator on the cell region; forming a first logic gate insulatoron the logic region; forming a second conductive film on the logic gateinsulator and the control gate insulator; patterning the secondconductive film, thereby forming a control gate on the control gateinsulator and forming a first logic gate on the first logic gateinsulator, such that the first logic gate and the control gate areformed in the same operation; forming a first logic well region byperforming a first ion implantation of dopants that pass through thefirst logic gate into the substrate; forming control gate spacers formedon each sidewall of the control gate and first logic gate spacers oneach sidewall of the first logic gate; forming a first source region anda first drain region on opposite sides of the control gate,respectively; and forming a first logic source region and a first logicdrain region on opposite sides of the first logic gate, respectively,wherein the first logic well region has a depth shallower below thefirst logic gate than a depth of the first logic well region withrespect to the first logic source region and the first logic drainregion.
 16. The method of claim 15, wherein the patterning the firstconductive film comprises: forming a first hard mask pattern on thefirst conductive film; and performing an etching of the first conductivefilm using the first hard mask pattern as a mask, thereby forming thefloating gate on the tunneling gate insulator, wherein the first hardmask pattern remains on a top surface of the floating gate.
 17. Themethod of claim 15, wherein the patterning the second conductive filmcomprises: forming a second hard mask pattern on the second conductivefilm on the logic region, wherein no second hard mask pattern is formedon the second conductive film on the cell region; and performing anetching process on the second conductive film using the second hard maskpattern as a mask, such that the first logic gate and the control gateare simultaneously formed on the logic region and the cell region,respectively.
 18. The method of claim 15, further comprising: forming adeep well region formed in the substrate, wherein the deep well regionencloses the first well region; and forming an LDD region formed in thefirst well region, wherein the LDD region encloses the first sourceregion and the first drain region.
 19. The method of claim 15, furthercomprising: forming a second logic well region by performing a secondion implantation of dopants passing through the second logic gate intothe substrate; forming a second logic source region and a second logicdrain region on opposite sides of the second logic gate, respectively;and wherein the second logic well region has a depth shallower below thesecond logic gate than a depth of the second logic well region withrespect to the second logic source region and the second logic drainregion.
 20. A semiconductor device, comprising: a substrate having acell region and a logic region, wherein a nonvolatile memory device isformed on the cell region and a logic device is formed on the logicregion; a first well region formed in the cell region of the substrate;a tunneling gate insulator formed on the first well region; a firstconductive film formed on the tunneling gate insulator; a floating gateformed on the tunneling gate insulator; a thick dielectric patternformed on sidewalls of the floating gate; a control gate insulatorformed on the cell region; a first logic gate insulator formed on thelogic region; a second conductive film formed on the logic gateinsulator and the control gate insulator; a control gate formed on thecontrol gate insulator; a first logic gate formed on the first logicgate insulator; a first logic well region formed by performing a firstion implantation of dopants passing through the first logic gate intothe substrate; control gate spacers formed on each sidewall of thecontrol gate and first logic gate spacers formed on each sidewall of thefirst logic gate; a first source region and a first drain region formedon opposite sides of the control gate, respectively; and a first logicsource region and a first logic drain region formed on opposite sides ofthe first logic gate, respectively.
 21. The semiconductor device ofclaim 20, wherein the first logic well region has a depth shallowerbelow the first logic gate than a depth of the first logic well regionwith respect to the first logic source region and the first logic drainregion.
 22. The semiconductor device of claim 20, wherein the firstlogic gate and the control gate are formed in the same operation. 23.The semiconductor device of claim 20, further comprising: a deep wellregion formed in the substrate, wherein the deep well region enclosesthe first well region; and a lightly doped drain (LDD) region formed inthe first well region, wherein the LDD region encloses the first sourceregion and the first drain region.
 24. The semiconductor device of claim20, further comprising: a second logic well region formed by performinga second ion implantation of dopants passing through the second logicgate into the substrate; a second logic source region and a second logicdrain region on opposite sides of the second logic gate, respectively;and wherein the second logic well region has a depth shallower below thesecond logic gate than a depth of the second logic well region withrespect to the second logic source region and the second logic drainregion.